JPH0684021U - Axial force support mechanism - Google Patents

Abstract

(57) [Summary] [Object] To provide an axial force support mechanism for a fluid rotating machine, which has a small number of constituent parts, is compact, and is free from contamination by lubricating oil. [Structure] Thrust bushes made of high-hardness ceramics or ceramic coating attached to a flange provided on the body of a fluid rotating machine via an elastic mechanism, and made of high-hardness ceramics attached to a rotary shaft, or A thrust collar having a ceramic coating is provided, and an end surface of the thrust collar and an end surface of the thrust bush opposite thereto are brought into contact with each other, and the contact surface is lubricated with discharge water.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an axial force support mechanism used for thrust support in a fluid rotary machine such as a pump.

[0002]

[Prior art]

 FIG. 18 is a vertical sectional view of a conventional axial force support mechanism. Conventionally, thrust bearings have been used to support axial force. In the figure, 3 is a pump body, 5 is a rotating shaft, M is a motor for driving the rotating shaft, 4 is a blade for pumping water attached to the end of the rotating shaft, and f is fixed inside the pump body 3. Is a roller type thrust bearing that is fitted inside the flange and that is mounted so as to hang on the stepped portion of the rotary shaft 5, and 7 is attached to the end surface of the flange f. A bearing retainer 6 is provided, 6 is a seal provided on the inner peripheral portion of the flange f, and 8 is a seal provided on the inner peripheral portion of the bearing retainer 7.

The thrust bearing 1 is surrounded by a flange f, a bearing retainer 7, a seal 6, a seal 8 and a rotary shaft 5 so as to be wrapped therein. Reference numeral 9 denotes a space surrounded by the above-mentioned members, which is a portion functioning as an oil-filling chamber. Reference numeral 10 denotes an oil supply hole penetrating the pump body 3 and the flange f and connected to the oil circulation chamber 9, and P denotes an oil supply pump for supplying oil to the oil chamber 9 via the oil supply hole 10. Thrust bearing 1 is lubricated by the supplied oil.

Arrow V is intake water, arrow W is discharge water, Po is discharge pressure, and arrow F is thrust generated on the rotary shaft 5 by the fluid force of discharge water. This thrust F is supported by the pump main body 3 via the step of the rotary shaft 5, the thrust bearing 1, the bearing retainer 7, and the flange f.

[0005]

[Problems to be solved by the device]

 The thrust bearing of the conventional axial force support mechanism is a rolling bearing type of oil lubrication system, which requires many components such as an oil chamber, an oil supply auxiliary machine such as a pump, and a seal, and is complicated. Also, since lubricating oil is used, if it leaks from the seal, it could lead to environmental pollution.

The present invention seeks to provide a new axial force support mechanism that has a small number of components, is compact, and is free from contamination.

[0007]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems, and is a thrust bush made of high-hardness ceramic or ceramic coating attached to a flange provided on the body of a fluid rotary machine via an elastic mechanism, and It is equipped with a thrust collar made of high-hardness ceramics or ceramic coating that is attached to the rotating shaft.The end surface of the thrust collar and the end surface of the thrust bush opposite to this are brought into contact with each other, and the contact surface is The present invention relates to an axial force support mechanism in a fluid rotating machine, which is lubricated with discharge water.

[0008]

[Action]

 Opposing contact surfaces made of ceramics or coated with ceramics slide on each other to support thrust. Ceramics or ceramic coatings prevent wear on sliding surfaces. The discharged water lubricates the sliding surface. The elastic mechanism interposed between the flange and the thrust bush prevents partial contact when shaft eccentricity or shaft tilt occurs.

[0009]

【Example】

 1 is a longitudinal sectional view of an axial force support mechanism according to a first embodiment of the present invention. In the figure, 3 is a pump body, 5 is a rotating shaft, M is a motor for driving the rotating shaft, 4 is a blade attached to the end of the rotating shaft, 11 is a thrust colorer attached to the rotating shaft. , 12 is a flange fixedly provided on the pump body, 14x is an elastic mechanism provided in the flange, 14y is an elastic body held by the elastic mechanism, and 13 is held by the elastic body. Thrust bush, one surface of which is in contact with one surface of the thrust collar 11. S is the pressure contact surface, V is suction water, W is discharge water, and Po is discharge pressure.

The thrust collar 11 is made of a ceramic or ceramic coating material having high hardness and good water lubricity, and the thrust bush 13 in contact with the thrust collar is also made of the same kind of ceramic or ceramic coating material. It Further, when the rotating shaft 5 rotates, the pressure contact surface S between them is lubricated with the discharge water W which is likely to contain foreign matter. The elastic body 14y is provided in the elastic mechanism 14x so that the pressure setting portion S can follow the shaft eccentricity and the like. In this device, opposing contact surfaces made of ceramics or coated with ceramic slide on each other to support thrust.

FIG. 2 is a vertical sectional view of an axial force support mechanism according to a second embodiment of the present invention. In the figure, 5 is a rotating shaft, 11 is a thrust collar attached to the rotating shaft, 3 is a pump body, and 12 is a flange attached to the pump body. The configuration up to this point is the same as that of the first embodiment. T is a support plate attached to the flange 12, and 14a is a rubber ring having an O-shaped cross section attached to the support plate. Two rubber rings having different ring diameters are concentrically attached. Reference numeral 15 is a thrust bush provided so as to be in contact with the rubber ring, 16 and 17 are holding plates that hold the thrust bush by pressing it from the outside and the inside, and 19 is a thrust bush 15 and the holding plates 16 and 17. Elastic bodies interposed respectively, S is a contact surface between the thrust bush 15 and the thrust collar 11, H is a surface opposite to the contact surface of the thrust bush, that is, a rear surface, and R is the same rear surface. H is a pressure chamber formed by being surrounded by the two rubber rings 14a and the flange 12, Po is a discharge pressure in the pump, and 18 is a pressure guiding tube for guiding the discharge pressure Po to the pressure chamber R.

FIG. 3 is a cross-sectional view showing another cross-sectional shape of the rubber ring according to this embodiment, showing a rubber ring 14b having a rectangular cross section. The cross-sectional shape of the rubber ring is arbitrary. Further, FIG. 4 is a perspective view of the vicinity of the thrust bush of this embodiment, showing the mutual relationship of the positions of the above-mentioned members.

FIG. 5 is an explanatory diagram of the acting force applied to the thrust bush 15 in this embodiment. In the figure, Ft is the thrust force applied from the thrust collar 11 to the thrust bush 15 according to the discharge pressure Po, Fo is the supporting force by which the water pressure in the pressure chamber R pushes the rear surface H of the thrust bush 15, and Fe is the thrust from the rubber ring. It is the elastic force applied to the back surface H of the bush. The thrust force Ft is supported by the support force Fo based on the discharge water pressure and the elastic force Fe. FIG. 6 shows the relationship between the magnitude of these forces and the discharge pressure Po.

FIG. 7 is a sectional view (a sectional view taken along the line AA of FIG. 2) of the thrust bush 15 in the above embodiment. The thrust bush 15 has a continuous annular shape. FIG. 8 is a perspective view of an end surface of the thrust bush. Further, FIG. 9 is an exploded view taken along line BB of FIG. On this end face, a ceramic coating K is applied to a part of the surface of the base material B, and the protrusions corresponding to the thickness thereof are provided in a uniform distribution. A step h is formed between the surface of the base material portion and the surface of the convex portion. When the shaft rotates, due to the dynamic pressure effect due to this step, a water film is generated on the pressure contact surface S that is in sliding contact with the coating portion K and the thrust collar 11, and the lubrication effect is improved.

FIG. 10 is a vertical sectional view of an axial force support mechanism according to a third embodiment of the present invention, FIG. 11 is a sectional view of a thrust bush in the same embodiment, and FIG. 12 is a partial sectional perspective view near the end face of the thrust bush. It is a figure. 15s is a split type thrust bush. That is, the thrust bush is composed of a plurality of (four in this embodiment) portions, and is arranged in an annular shape as a whole. Further, there is only one rubber ring 14c having an O-shaped cross section. Further, in the split type thrust bush as in the present embodiment, the discharge water can enter the back surface of the thrust bush from the split gap, so that the pressure guiding pipe 18 provided in the second embodiment is provided. Not not. The configuration other than the above is the same as that of the second embodiment.

FIG. 13 is a longitudinal sectional view of an axial force support mechanism according to a fourth embodiment of the present invention, and FIG. 14 is a partial sectional perspective view of a thrust bush in the same embodiment. The present embodiment is an example in which the divided thrust bushes are supported not by a rubber ring but by a single rubber cord 20 for each bush. FIG. 15 is a partial cross-sectional perspective view of a thrust bush of another example of the elastic band 20 of this embodiment, in which each one bush is supported by two elastic bands. The number of elastic bands is arbitrary.

FIG. 16 is a vertical sectional view of an axial force support mechanism according to a fifth embodiment of the present invention, and FIG. 17 is a horizontal sectional view of the same embodiment (a sectional view taken along line CC of FIG. 16). This embodiment is the same as the third and fourth embodiments in that the split thrust bush 15s is used. Further, the point that the pressure guiding tube 18 is provided is the same as the second embodiment. The present embodiment is characterized in that an O-ring 21 having a small diameter forms an individual pressure chamber Q for holding the discharge pressure introduced from the pressure guiding pipe on the back surface H side of each split thrust bush 15s.

The operation and effect of each of the above embodiments can be summarized as follows.

(1) The shaft and the thrust bush, which are made of ceramics or ceramic coating with good water lubricity, are brought into contact pressure with each other and lubricated with discharge water, so that the shaft can be lubricated without oil lubrication that may cause contamination. Can support power.

(2) Due to the contact surface formed by high hardness ceramics or ceramic coating, it is resistant to abrasion by foreign matter contained in water, and a working fluid containing foreign matter water can be used as it is, and a compact oil supply system is not required. An axial support mechanism is provided.

(3) In the case where the ceramic coating pressure contact surface is provided with a step or the like, a dynamic pressure is generated on the pressure contact surface by rotation, and a water film is effectively formed on the pressure contact surface, so that water lubricity is further improved. Get better.

(4) Since the thrust bush is supported by the elastic material, it is possible to follow the shaft eccentricity and the shaft inclination, and no one-sided contact occurs.

(5) The back surface of the thrust bush is supported by an elastic body having an O-shaped cross section, a rectangular shape, etc., and in the case where the discharge pressure is applied to the back surface, it is easy to follow the tendency such as shaft eccentricity. Moreover, since the thrust that increases in proportion to the discharge pressure is supported, a more stable contact surface is formed.

[0024]

[Effect of device]

 The axial force supporting mechanism in a fluid rotary machine of the present invention is a thrust bush made of high hardness ceramics or ceramic coating, which is attached to a flange provided on the body of the fluid rotary machine via an elastic mechanism, and a rotary bush. The shaft is equipped with a thrust collar made of high-hardness ceramic or coated with ceramic, and the end face of the thrust collar and the end face of the thrust bush opposite to it are brought into contact with each other, and the contact face is discharged with water. Since it is lubricated, it is possible to provide an axial force support mechanism that has few components, is compact, and is free from contamination by lubricating oil.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an axial force support mechanism according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of an axial force support mechanism according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing another sectional shape of the rubber ring in the example.

FIG. 4 is a perspective view around the thrust bush of the embodiment.

FIG. 5 is an explanatory view of acting force of the embodiment.

FIG. 6 is a diagram showing the relationship between the acting force and the discharge pressure in the embodiment.

FIG. 7 is a sectional view of the thrust bush in the embodiment (a sectional view taken along the line AA in FIG. 2).

FIG. 8 is a perspective view of an end surface of the thrust bush in the embodiment.

FIG. 9 is a sectional development view of a thrust bush in the embodiment (BB sectional view of FIG. 8).

FIG. 10 is a vertical sectional view of an axial force support mechanism according to a third embodiment of the present invention.

FIG. 11 is a cross-sectional view of the thrust bush in the same embodiment.

FIG. 12 is a perspective view around the thrust bush of the embodiment.

FIG. 13 is a vertical sectional view of an axial force support mechanism according to a fourth embodiment of the present invention.

FIG. 14 is a partial cross-sectional perspective view showing a thrust bush and a supporting member in the same embodiment.

FIG. 15 is a partial cross-sectional perspective view showing another arrangement of the thrust bush and the support member in the embodiment.

FIG. 16 is a vertical sectional view of an axial force support mechanism according to a fifth embodiment of the present invention.

FIG. 17 is a vertical cross-sectional view of the same embodiment (cross-sectional view taken along the line CC in FIG. 16).

FIG. 18 is a vertical sectional view of a conventional axial force support mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thrust bearing 3 Pump body 4 Blade 5 Rotating shaft 6 Seal 7 Bearing retainer 8 Seal 9 Oil lubrication chamber 10 Oil supply hole 11 Thrust collar 12 Flange 13 Thrust bush 14a, 14b, 14c Rubber ring 14x Elastic mechanism 14y Elastic body 15 Thrust bush 15s Split type thrust bush 16 Presser plate 17 Presser plate 18 Isobar 19 Elastic body 20 Rubber string 21 O-ring B Base material F Thrust Fo Support force Fe Elastic force Ft Thrust force f Flange H Back surface h Step K Ceramic coating M Motor P Oil supply Pump Po Discharge pressure Q Individual pressure chamber R Pressure chamber S Contact surface T Support plate V Intake water W Discharge water

Claims (1)

[Scope of utility model registration request] 1. A thrust bush made of high-hardness ceramics or provided with a ceramic coating, which is attached to a flange provided on the body of a fluid rotating machine via an elastic mechanism, and high-hardness ceramics attached to a rotary shaft. And a ceramic coating-provided thrust collar, the end surface of the thrust collar and the end surface of the thrust bush opposite thereto are brought into contact with each other, and the contact surface is lubricated with discharge water. Axial force support mechanism in machines.